Process of and apparatus for craping paper.



F; H. FULLER. PROCESS OF AND APPARATUS ron CRAPINGI PAPER. APPLICATION FILED FEB. H. 1913.

l,1%3,377., Patented June 15, 1915.

Application filed February 11, 1913. Serial it To all whom it'may concern of Potsdam, in the county of St. Lawrence,

and in the State of New York, have invented a certain new and useful. Improvement in Processes of and Apparatus for Craping Paper. and do hereby declare that the following is a full,'clear, and exact description thereof.

My invention relates to a process of and apparatus for producing craped or crimped paper of many different kinds, but it particularly relates to the .productionof such papers for paper napkins, paper towels, wall papers and stretchable bag papers.

Hitherto craped papers have been made by crimping the paper while cool and in a moist condition or when partially dried. Papers when crimped in this manner do not hold the crimping properly as they immediately tend to return to the uncrimped state. Furthermore, papers which have been crimped upon machines hitherto used for this purpose, have frequently had the crimped Web of cool, moist paper arranged in such a manner immediately after the crimping, that it moves in a substantially horizontal direction and, as a result, the paper has lost a considerable portion of its crimping, owing to the weight of the paper bending and dragging the web downwardly and stretching the paper to remove the crimping.

The object of my invention is to provide a process and apparatus for producing crimped paper in such a manner that it will retain its crimping far better than paper made with previous methods and machines. Practically all crimped paper is made from sulfite or soda fiber and ground wood pulp. Wood pulp produced in this manner contains a certain amount of resin and resinous materials which may act as binders for the fibers of the paper stock. In carrying out my invention, I make use of this a fact by producing the crimping in the paper when heated to such a temperature as to render liquid or plastic the resin or resinous materials contained in the paper stock, so that when the crimped paper is cooled and dried after the crimping, the crimped-paper Specification of Letters Patent.

felt-1 contained in pressure rolls 4 of any Patented June 15, was.

acquires a set which is permanently retained by the paper. Furthermore, I provide an apparatus'for producing crimped paper in this manner which is so arranged that the crimped web of paper will not sag to remove the crimping, My process takes advantage of the fact, also, that fiber, when treated with steam or 'hot water, can be much more readily bent or changed into a given form than in the case when the fiber is merely moist and cold, and that when so treated by steam or hot water and bent into the desired shape, it holds its shape for an indefinite length of time.

it will be understood that my process and apparatus may be embodied in many dilferout forms, but for the purpose of illustration I have described herein one form of my process and described and shown a machine for carrying out the same, and have shown said machine in the accompanying drawings, in which the figure is a diagrammatic view of a machine made in accordance with my invention, whereby my process may be carried out.

In the drawings, I have shown a bottom a paper machine of any desired character, delivering a moist web of paper 2. The band of feltl passes over a suction box 3 for removing excessive moisture from the web 2, and thereafter it conveys the web of paper 2 between a pair of desired character, the upper pressure roll 4: being provided with an upper felt band 5 same and upwardly therefrom. The force of the pressure rolls 4 causesthe web of paper 2 to adhere to the upper felt 5 so that it passes upwardly from'the upper pressure roll a with said felt '5. pressure roll 4, the lower felt band is returned to its starting point by passing over a number of guide rolls 6. The upper felt 5 having the web of paper 2 adheriin to the under surface thereof, passes upwar ly over a preliminary heating roll 7 heated by steam orin any other desired manner, and at the upper portion thereof, the upper felt 5 and web of paper 2 pass under apressure roll 8 adapted to press the web of paper 2 against the preliminaryheating'roll 7 in such a manpassing around the 'From the lower highly heated in the paper to steam,

ner that the web of paper adheres to the surface of the preliminary heating roll and becomes separated from the upper felt 5 which'is returned to its starting point rearwardly, by passing around the pressure roll 8. While on the preliminary heatin roll. .7, the web of paper 18 heated to a considerable extent so as to chan e at least a portion of the water in the we of paper into steam. The paper stock in the web 0 paper thereby becomes subjected to treatment with a body of steam, which is brought into contact with every portion thereof and into intimate contact w1th the fibers of the same. -When the web of paper has been heated by the body of steamin this manner, it comes into contact, at the lower surface of the heating roll 7, with a blunt-edged scraperor crimper 9. The crimping of the paper is effected by the blunt edge of said scraper and the depth of the crimping may be regulated or adjusted by the degree of bluntness or the width of the edge of said scraper. After being crimped, the paper passes downwardly and is received by the drier which, in this instance, is shown as a series of staggered,-

heated rolls 10, having a lower felt band 11 and an upper felt band 12 carried in contact therewlth by means of a number of guide rolls 13. The first of the rolls 10 and the lower felt 11 are so arranged that the crimped web of paper passes between the same and therefrom is led to the next roll 10 located at a higher elevation, and over which passes the upper felt 12. From this upper roll, the crimped web passes downwardly to the next roll 10 in the series, and the drying of the web is continued in this manner until it has passed through the whole drying'machine and has become thoroughly dried.

In the operation of the process, the moist web of paper which is conveyed forwardly upon the felt l, is caused to adhere to the upper felt 5 by the pressure exerted between the pressure rolls 4:. The web 2 then passes upwardly to the preliminary heater where pressure from the pressure roll 8 causes the web of paper to adhere to the preliminary heating roll. The heat from this roll changes at least some of the water so as to thereby subiect .the' web to the intimate action of a body of steam. The resin and resinous materials remaining in the paper stock, which is usually sulfite or soda fiber, and ground wood pulp stock, are this changed into a liquid or plastic condition, and while in this condition the paper is given the crimped form by' the action of the scraper or crimper 9. The web of paper 2 tends to become cooled immediately that it leaves the preliminary heater 7, and the crimper 9, and therefore immediately begins to acquire a set, owing to the hardentherein and also owing to the well-known acquires of the resin and resinous materials fact that wood, when given a particular form while subjected to moisture'and heat, the form given permanently. From this point, the crimped .paper is led downwardly in such sagging, and is finally conducted into the,

drying apparatus where it is thoroughly dried. 1

While I have described my invention above indetail, I wish it to be understood that many changes may be made therein without departing from the spirit thereof.

I claim:

1. The process which comprises pressing a moist web of paper against a heated traveling carrier to cause the web of paper to adhere to said heated carrier, conveying the web of paper immediately after the pressing operation on the upper side of the heated carrier and then crimping said paper while on the under surface of said carrier.

2. The process which comprises pressing a moist webof paper against a heated roll to cause the web of paper to adhere to said heated roll, conveying the web of paper im mediately after the pressing operation on the upperside of the heated roll and then crimping said paper while on the under surface of said roll.

3. The process which comprises pressing a moist web of paper into contact with a. heated traveling carrier to cause the web of paper to adhere thereto, conveying the web of paper upon the carrier after the pressing operation and then crimping the web of a manner as to avoid paper while on the under surface of the heated carrier.

4. The process which comprises pressing a moist .webof paper into contact with a heated roll to cause the web of paper to adhere thereto, conveying the web of paper upon the roll after the pressing operation an then crimping the web of paper while on the under surface of the heated roll.

5. The process which comprises pressing a moist web of paper against the upper side of a heated traveling carrier and then crimping the paper on the undersideof the carrier.

6. The rocess which comprises pressing a moist we of pa er against a heated traveling carrier an then crimping the paper the mg the paper web w top felt against the heated roll at or above the level of the am's of the heated roll, and a bhmt-edged crimping doctor for crimp- 'le on the heated roll.

9. In combination, a paper-web carrying apron, a heated roll for recelving the paper- Web therefi-om, the apron being located ebeve the heated roll, and means for crimp 

